Safety car equipment



May 19, 1931. F. B. THOMAS SAFETY CAR EQUIPMENT Filed Jan. 18, 1930INVENTOR {'3 FRANK a. THOMAS said valves being 48 to seat valve 50 andunseat valve 45 when magnet 44 is deenergized.

The application magnet valve device comprises a magnet 52, a valve 53contained in a chamber 54, and a valve 55 contained in a chamber 56. Aspring 59 in chamber 56 is adapted to seat valve 55 and unseat valve 53when the magnet 52 is deenergized.

The door operating engine 4 comprises two pistons 60 and 61 which areconnected by a stem 62 provided on one side with a rack of gear teeth. I

The piston 60 has at one side a chamber 63 and the piston 61 has at theopposite side a chamber 64. The chambers 63 and 64 are connected bypassages 65 and 66, respectively, to a valve 67 adapted to control thefluid pressure in said chambers. For operating the valve 67, a piston 68is provided having a stem 69 connected to an operating arm 70 which issecured to the valve. The piston 68 hasat one side a chamber 71 and atthe opposits side a chamber 72. A spring 73 contained in chamber 72 isadapted at one time tofmove the piston 68 and valve 67 to the doorclosed position shown in the drawing.

Engaging the gear toothed rack on stem 62 is a gear'segme'nt 74fulcrumed on a pin 75. The segment 74 has anarm 7 6 to which is attacheda rod 77, which is adapted to operate the car door (not shown). Alsosecured to the arm 76 is one end of a link 78, the other end of saidlink being fastened to astem 79. The stem 79 is adapted to operatethrough a suitable bore in the casing and is provi edatits outer endwith a movable contact 80, which is insulated from the stem 79' and isadapted to normally bridge two fixed contacts 81 and 82.' v

For controlling the operation of the door engine piston 68, a doorengine magnet valve device is provided and comprises a magnet 84, avalve 85 contained in a chamber 86, and a valve 87 contained in achamber 88, adapted to be operated by said magnet. spring 89 is providedin chamber 88 and is adapted to seat valve 87 and unseat valve 85 whenthe magnet 84 is deenergized.

In operation, the brake switch device 1 is normally carried in therelease position, the controller handle 12 is normally depressed and thecar door engine is in the door closed position, as shown in the drawing.

With the brake switch device in release position, the movable contact 7connects the stationary contacts 9 and 8, so that electric current ispermitted to flow from any suitable source of electrical energy, such asa battery 90, havinga ground connection 91,

throu h wire 92, contacts 9, 7 and 8, to wire 93 lea ing to thestationary contact 81 in the door engine. The door engine being in thedoor closed position, the movable contactj80 connects contacts 81 and 82so that electric current is permitted to flow from contact 81 throughcontacts 80 and 82 to wire 41.

With the controller handle 12 depressed, spring 24 seats valve 20 andcauses movable contact 25 on bell crank lever 23 to engage the fixedcontacts 27 and 26, thereby permitting electric current to flow fromwire 41 to wire 42 and from thence through the release magnet 44 to aground 94. The release magnet is thereby energized and operates to seatvalve 45 and unseat valve 47.

With the brake switch device in the release position, no current issupplied to stationary contact 10 which is connected through wire 95 tothe application magnet 52. Consequently, the magnet-52 is deenergizedand spring 59 seats the Valve 55 and unseatsthe valve 53; Likewise, nocurrent is supplied to the stationary contact 11 of the brake switchdevice, which contact is connected by wire 120 to the doorengine magnet84. The door engine magnet is thus normally deenergized, permittingspring 89 to seat valve 87 and unseat valve 85. The door engine pistonchamber 71 is thus opened to the atmosphere through pipe 122, past theunseated magnet valve 85 and through an atmospheric exhaust port 98.

' Fluid under pressure is so plied to the main reservoir 6 in the usuawell known manner and flows therefrom through pipe and passa e 98 to theapplication magnet valve cham ber 56 and to the emergency valve chamber32.

In initiall charging the equipment, the pressure of uid supplied to theemergency valve chamber 32 acts on the piston 29 and shifts said pistonupwardly into engagement with a gasket 99. This moves the emergencyslide valve 31 upwardly to emergency position in which a passage 103 isuncovered. Fluid under pressure then flows from valve chamber 32 throughpassage and pipe 103 to the brake cylinder 5 and applies the brakes.

The release magnet valve 47 being unseated by energization of magnet 44,'fluid under pressure also flows from the brake cylinder passage103,through chamber 48, past valve 47 to a chamber 104, and from thencethrough passage 105 to the seat of the emergency slide valve 31.

In emergency position of the emergency slide valve, a cavity 106connects passage 105 to passage 101, which permits fluid under pressureto flow from passage 105 to passage 101 leading'to the emergency pistonchamber 30 and to the valve 100 in the brake switch device 1. I

In release position of the brake switch device, pipe 101 is connectedthrough cavity 123 in the valve 100 to the safety control pipe 130leading to pilotvalve chamber 21, and

.with the controller handle 12 depressed, the

pilot valve 20 is seated. Thus, the fluid under pressure flowing to pipe101 builds up a pres- I the normal position, the emergency switch VWhich'contact connects the cont'actBQf n- 'nectedq to Wire-4110 contactconnectedito contact 25 as well 'asithrough the emergencyi the drawing,in which positionfa feed: groove and valve chamber 32;

--thereby permitting a release'of-the' brakesif mom-t:

sure in thee'me'rgency piston'chainbe'i' 30, a11d when a predeterminedpressure is f obta ined 5 therein, the' spring 33 shifts "the piston29and slide valve 31 tojth'e normal position showniin' 107 is opened andpermitsfre'e cor'nrnunicw" tionbetween the opposite sides, of theemergen'cy piston 29, "consequently equalization of fluid pressures inpiston chamber-i30 In the normal position" of the-emergency slidevalveythepassage 103 is lappechthereby cu'ttiin'g off the supply of'fluid 'under pressure to tlie brake cylinder 5', audit-he brakecylinder'j 1 is openedto the atmospherethroughpipe and passage 103,-release magnetivalvechamber 4-8, past unseated valve- 4:7, throughchamber a 10 1, passage 105, cavity 10cm the emergency; slidej'ya'lve 31and atmospheric assage 108, 1

In the normal position, of the emergency slide valve; apassagerl09fisuncovered,W-hich permits fluid under pressureto flow from' the emergencyvalve chamber 32 to the dooricon-' trol magnet valve chamber '88 andto-valve G'Zofthedoor operatingengine li WVith the cloor=engine valve67' in the door closed posi tion; as shown in f-the drav'ving,; fluidunder pressure is permitted to flow from passage =109,tl1rough a cavity110'in the valve-67 to passage leading'to' thepiston chamber 63:1 The'piston chambert l is OpllftO the ethics; phere throughpassagei66gcavity; 111 inthe valveiG'Z and an atmospheric exhaustpassage 112.2 The pressure of fluid;suppliedfto piston chamber-63 isthereby-permitted to' ma intainj;

piston chamber 113 i's open-to theatmospher-e.

through passage 114-, cavity 115 injtheerner gency slide valve.31,-iandfatmospheric exhaust passage 108. This permits' spring 38torshift'if the'fl'svvitch piston 34 and movableconta'ct 35 tothegpositiou shown in" the" draWing, f-in 1 Wire 42. Th'e'-wires 41 42=aife thus'cona nected through the controller handle SWltCll switchcontact v 4 t Toefiect-a serviceapplication oiithebrakeg s;

thedrum; of the brake svvitchdevice 1' is moved to service door closedposition, in Which the m'ov'abl'e contact-7 connects station Iarycontact9 from thebattery QO to stationary 1 V loeri6'3to theatmosphere throughpassage 65,..

cavity 111 in: the valve F 67,v and atmospheric contact 10; Electric-current is "thusii per i:

mitted to flowthrougli contact 10; in; and application magnet m toground 116, thereby 6 g I v V is supplied to the i piston ;,cha'n1ber-';641 from, passage 109 through'c'avity in thevalve 67 and passage 66; Thepressure of ,flu'id in energizingif'said v magnet. No "connection madetothe release magnet stationary'contact-8 inthe brake-switch device,sothat the release" magnet 44- is therefore deenergized',

whichperniits "spring? 51 toseat when and ".unseatvalve45. a

Energ-izationio'f the application magnet 52 seats valve 53amunseats'valve '55, which pen; 5 mits fluid under "pressure to flowfrom-the: main re servoir fithrough pipe 'and passage 98, pasttheunseated'application, magnet valve 55 to; chamber 117 and ifrom 'thencethrough" passage 118,; pTaSt a'Iball, check valve 11 9 to i passage"andfip'ipe 103; through which fluid under Epressure =fi0ws' to the brakecylinder 5 and appliesthebrakesl When*thesdesired'degree"of tion "is"obtained; 'the brake i switch device is brake ap lica-a moved to lappositi on' in vhich'the supply of i' electric current to the applicationvmagnet 52;;isj-cut=ofl".: The application magnet fisw V therebytdeenergized,'ipermitting spring 59 to seat valve 55 and prevent further'flow of fluid under pressure to chamber 117 leading'to the;

brake cylinder :5 through zpassage- 118; pasta; checkfvalveJ-m *andthrough passageand I I lf'it is desired to"stopfithe-carrfor taking0111301 *(lischarging: passenger's fithe brake switch-device may be"moved to service door' closed position; in which I fluid under pressureis'su'ppliedfto the brake cylinder 5 inithe same'iz V manner; ashereilibefore described. WVhenx the car becomes substantially stopped,iz the operatoifnzayfthen moveithe brake switch dea service door openingposition; 7

Y service door opening kpositionf of the brake switch device,'-nthemovable "contact. 7-

@viceifroni 1 service door closec'lf .'position to thebrakeswitchdevicez' -1 j I Electr c current being :su

wjire 120tothe doorqengine'magnet 84:, en

ergizes said inagnet whichg'operatsi tossat ,valve 857aand'iunseat'zvalve '87.: The unseat-f ing of valve 87 permits fluid atmain reser-' voir pressure-to flow from pipe -109"through a valve?chamber. 88, rpast =valve 87, through it piston 68. i The .pressurehof'fluid jin chamber wchamberilaiand passage-and pipe 122 to-the -.piston:chamber .171 10f the valve; controlling? '7l thenmovespiston 68tothelettpvvhich roa .tates zthe xvalve 67 in :a clockwise direction I :todoor fopeningriposition, in Which-fluid "un-z;

dergpressuref isvented fron 'the piston chami exhaustpassagejll'i andfluidundergpres'sure 1 tes 1 the piston chamber64 then shifts thepistons 61 and 60to the left, or door opening POSlt'i tion. I

The movement. to the leftof the door engine pistons 60 and.61, causesthe gear segment "74 to rotate in a clockwise direction which operatesarm 76 topull rod ,7 7 to open the car door (not shown). ,At the same Torelease the brakes after taking on or dischargingpassengers, the brakeswitch device is moved to release position, in which the stationarycontact 7 again connects the cur rent supply wire contact 9 to therelease magnet wire contact 8 and the current supply is cut off from theapplication magnet wire contact 10 and door opening magnet wirecontactll. l

The application magnet 52 is thus cdeenergized and permits spring 59 toseat valve sons to cut off the supply of fluid under pressure tothebrake cylinder. The door engine magnet 84 is also deenergized, whichpermits sprin 89'to seat valve 87 and unseat valve 85. 1 he unseating ofmagnet valve 85 ermits fluid under pressure to be vented remv the pistonchamber 71 through passage and'pipe 122, chamber 121 in the door enginemagnet, past the unseated valve 85 1, 'and throu h the -atmosphericpassage 98.

With the uid under pressure thus vented from the piston chamber 71,spring 73 moves piston 68 to thedoor closed position shown in thedrawing. This movement of piston 68 turns the valve 67 to doorclosedposition, in whichifluid under pressure is vented from piston chamber 64through passage 66, cav

ity 111 in the valve 67, and atmospheric passage 112 and fluid underpressure is supplied to piston chamber 63 from passa'ge109 by wayzofcavity 110 in the valve'67 and passage The fluid under pressure suppliedto'piston chamber 63 shifts the pistons and 61' to doorclosed position,in which the gear segment is returned to the position shownin thedrawing, thereby operating rod 77 to close the car door and alsooperating the movable contact 80 to bridge fixed contacts 81 and 82.

The bridgin of contacts 81 andl82 con-v neetswire 93 from the brakeswitch device to'wire 41; Wire 41 is connected torelease magnet wire 42through the controller handle switch contact 25 when the handle 12 isdepressed, and also through the emergency switch contact 35. Electriccurrent is thus supplied to the release magnet 44, which becomesenergized and seats valve 45 and unseats valve 47. I a I The unseatingof release magnet valve47 connects the brake cylinder passage 103 topassage 105 which permits fluid under pressure to flow from the brakecylinder 5 through saidvpassages, cavity 106 in the emergency slidevalve 31, and atmospheric passage 108, thereby efl'ecting a release ofthe brakes. I

It will be noted from the above description of operation that therelease magnet 44 is not energized to release the brakes upon movementof the brake switch device to release position so long as the doorengine re; mains in thedoor open position, since the release magnetcircuit is then open at the door engine switch 80. However, uponmovement of the door engineto door closed position, the switch 80 isoperated to close the release magnet circuit after which the releasemagnet will be energized and will operate to effect a releaseof thebrakes To effect an emergency application of the brakes, the brakeswitch device is moved to emergency position in which the movablecontact 7 engages the application magnet stationary contact 10, thussupplying electric current through wire 95 tothe application magnet 52which becomes energized and operates to supply fluid under ressure fromthe main reservoir 6 to the brake cylinder in the same manner as when aservice application of the brakes is efiected.

In emergency position of the brake switch device 1, the emergencypipe101 is also connected to the atmosphere throu h the atmosphericexhaust port 102 in t e valve 100.

Since the emergency pipe 101 is connected to the emergency pistonchamber 30, fluid under pressure is thereby vented from, said chamber.The pressure of fluid in the emergency valve chamber 32 then shifts theemergency piston 29 and slide valve 31u'pwardly to emergenply position,in which passage 103 is uncovere and permits fluid at main reservoirpressure to flow ,from the emergency valve chamber 32 through passageand pipe 2 103 to the brake cylinder 5. Fluid under pressure is thussupplied to the brake cylinder in emergency y operation of both theemergency valve device and application magnetvalve device and therebyefl'ects an emergency application of the brakes.

In emergency position of the emergency slide valve, a port 125 in saidslide valve registers with passage 114 and permits fluid under pressureto flow from the valve chamber 32 to the emergency switch iston chamber113. The pressure in .cham r 113 then shifts the piston 34 upwardly,causing the movable switch contact 35 to be moved out of enga ement withthe fixed contacts 39 and 40. urthermore, the door engine supply passage109 is connected to the atmosphere through cavity 115 in the emergencyslide valve 31 and atmospheric passage 108. The door engine pistonchamber 63 being cona e 6 anlea y -ll e the 's l el iv vefil f d: nderjp e rur ii v nte a here r m:

. pressure in the doc m; closed; position of the l e ng ne, he do r ng-ne p s cn Since the piston chamber til isatfatmospheric;

- 61 are balancedas tofluidpressureso;as to permit hand 0 6; 21:1 11QfgtllgClQOfl ifdesired; To release the brakes after; an energency pplia n is e t d a in dee r bed fib brakeswitch devieeis moved to releaseposition in which the current supply wire 92 is connected to wire 93.The door engine mu'st thenbe manually shifted to closed position, iwhich causesswitch 80 to bridge contacts 81 and 32 and thusconnect wire93 to wire 41.

The controller handle 12is1then depressed to; v t

the same manner ashere-inbefore described,

permit spring Ztto seat pilot valve 20xand l, move contact 25*intoengagement with con-i tacts'26 and 27 so as to connectiwire '41 to Qwire 42 leading to'therelease magnet ll. A circuit is thus closedthrough the battery 90] and release magnet, but in orderto close said Icircuit it will be noted that the car door must 1 be closed, the brakevalve must bemoved to irelease position, and the: controllerhandle 12.must be depressed. V V Y 1 The energization of the release magnet seatsvalve 45 and unseats valve 47. Fluid under pressure is thereby permittedjto flow embodiment orioth from main reservoir 6 through pipe and passage 98, emergency valve chamber 32, pas-g sage 103, past the. unseatedrelease magnet; valve 47, through chamber 104 passage 105,

cavity 106 in the emergency slide valve 31' and.

passage 101 to the emergency piston chamber 1 30 and to the brake switchdevice 1, Inre- -T lease position of the brake switch device, the;emergency pipe 101 is connected through cavity 123 to the safety controlpipe '130',which,

however, is lappedin the safety controldeviceu by the pilot valve 20being seated. 1 Fluid.

pressu'reis' thus permitted to build up in the; emergency piston chamber'30 and when a pre p determinedpressure is thus obtained in said pistonchamber the spring 33 shiftsjthe emergency piston 29 and slide valve3lto their normal position. v e

In the normal position of the emergency: slide valve, the brake cylinder5 is opened-' to the atmosphere through pipe andpassage I V 103, pastthe release magnet valve 4Y,'through chamber 10%, passage 105 ,'o'avity106 in the emergency slide valve and atmospheric passage-108, therebypermitting a release-ofthezbrakes; At the same time as thebrakes arefthus released, fluid underrpressure is vented;

from the emergency switch piston'ichamber i I 113 through passage 114,cavity 115 in' th r lmgt e carotor; c r urtm agne emergency slide valveand atmospheric pasl sage 108. Spring 38 then shifts the emergencyswitch piston 34 downwardly to its nor mal position, in'which switchcontact 35 again i, connects contacts'39 and 40. I If for any reason theoperator becomesin capacitated when, the brake switch device; 1 isineitherreleaseorlap position andlfi: go of, the controller; handle 1 2,the pressure, of spring 191 acts through the pin 15 i so, as to; e-

"pres's'the cjl'ight'arm of the bellcrank lever; 23; and ,thereby;cause, the. movement ot the" leftfarm' to'unseatlthe. pilot-valve 20"Unseifinei he riletr v fve i fiuid' nde pressure from. the- ;safetycontrol pipe, 130. The safety controlfpipe being connected n ws-. Cav yi 3eiiv el0 l i th brak W Q rii etefih emergency spamme se: Pr ur i rens me mer ee p pe and ,thus .v from the emergency p ston chamber SlLAsemer e cy application of tliebrakes is therebyefiected' by operationof" the emergency piston 29 and slide valve-31in ,Tov lve i es: ft an;emerg ncy @PPli i fi Q :O e rake 1 is e fectedi t e,

manner iu tsc iie ahe penetrate h re re d se ihe brakes Wil lbereleased;in the samem annerl as Wh 01 16i us r ee nhe i nent bfltl invention hasbeen described in-detail, t vis not my'intention to. limit itsscoper tothat 1 T eeo bieat oek fi 19 n ne e wisetha by he te msl itnd de 'msconlinglth openi g d l s nge ,ae

dea er? 15Mb, n lec r a ylep r-31nd mean Qr-1. cont-rolling h e ase fsbrakes: 32f means c n rol ed by an hand op rat :me efiev e e 10f:- th brke -Q deeriandsa POWGr ceetre le hali dle er-Q91 and. mean eoil l dbr sid dee en n t prev ting the ep re iee of sa le r ca -1y margin ma 'mo oreu a a ma n valve; device; adapted upon energigation to efi t he rease/e th bra es andpon d energiza i nlt ,i r nt the re ea e e h brakes:a swi c lderi e a i -.'w bh a 1 0 e g an an th fiw t hid ri'c ass iatedw h said po r rcqn cl end e sa switch devices being adapted to QQQlZIQljthe circuitzof said magnet valve device.

1 1 The mbinat on-W h zdoe lengi'nefor ont o l g the openi g: nd: ele g0 5: a c e doorya arower.con ollerihandle r rak s-a Switchleriassociated eased dooriefi ine and a o er swi eh e ic assodate with -$aidpei t entre ll rhanclle and 2 in series with said door engine switchdevice, either of said'switch devices being adapted to control .thecircuit of said magnet'valve; device independently of the otherswitchdevice.

" I 4. The combination with a door engine ffor controlling the openingand closing of a rear door,and a depressiblepower controller" handle forcontrolling the car motor circuit, of a magnet valve device adapted uponenergization to eifect the release of the brakes and upon deenergizationto prevent the release of the brakes, a switch device associated withsaid door engine and another switch device associated with said powercontroller handle,

:said switch devicesbeing operated when the door engine is inpositionfor closing the car door and when the power controller handle and the isdepressed for closing the circuit of said magnet valve devicefand whenthe door engine is in posit-ion for opening the car door ower controllerhandle is not depresed, or opening said circuit.

5. The combination with a door engine for my hand, this 16th day ofJanuary, 1930.

FRANK B. THOMAS.

controlling the opening and closing of a car door, of a valve forcontrolling the release .of the brakes, a magnet for controlling saidvalve, a switch device associated with said door engine, a powercontroller handle, a switch device associated with said power controllerhandle, a manually operated switch device, said switch devices-beingarranged in series to control the circuit through said magnet.

6. In a fluid pressure brake, the combination with a'brake cylinder, ofan emergency *valve device operative in emergency posi-' 'tion to sup lyfluid under pressure to said brake cylin er to effect an application ofthe g ative when energized to control the venting of fluid underpressure from said brake cylunder, an emergency switch device operativein the emergency position of said emergency valve'device to open onecircuit through said -release magnet valve device for deenergizingbrakes, a release magnet valve device oper same to prevent venting offluid under pres-' i sure from said brake 'cylinder,a switch deviceassociated with a power controller handle arranged in arallel with saidemergen'v switch device or'opening another circuit through said releasemagnet valve'device, and a switch device associated with a door engineand arranged in circuit with said two parallel arranged switches andoperative when said'door engine is in position for opening a car doorfor opening the circuit of said re ease magnet valve device forpreventing the venting of fluid under pressure from said brake cylinder.

7 The combination with a door engine for controlling a car door, of amagnet valve device" for controlling the operation of said door engine,a release magnet valve device for controlling the release of the brakes,means

